For God to prove himself on demand, physically, would be a grave disappointment, and the strongest Christians should be considerably grateful that he chooses not to do so. The skeptic endlessly demands proof, yet God refuses to insult the true intelligence of man, the '6th sense', the chief quality, the acumen which distinguishes man from the rest of creation, faith.
[God says] Discipleship is not limited to what you can comprehend - it must transcend all comprehension. Plunge into the deep waters beyond your own comprehension, and I will help you to comprehend even as I do. Bewilderment is the true comprehension. Not to know where you are going is the true knowledge. My comprehension transcends yours.
When you read a manuscript that has been damaged by water, fire, light or just the passing of the years, your eye needs to study not just the shape of the letters but other marks of production. The speed of the pen. The pressure of the hand on the page. Breaks and releases in the flow. You must relax. Thing of nothing. Until you wake into a dream where you are at once a pen flying of vellum and the vellum itself with the touch of ink tickling your surface. Then you can read it. The intention of the writer, his thoughts, his hesitations, his longings and his meaning. You can read as clearly as if you were the very candlelight illuminating the page as the pen speeds over it.